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gj5957
Ok, if there are not any parentheses, and we do the problem in order, we would do it like this: 5-6-7-12. The answer would be -20. 
VSX
If there is no parentheses at all you would do it like this:5-6-7-12. After it would be -20 because 5-6 is -1 and -7-12 is -19. -1-19 would be -20. Ask anytime;)